Which of the following is used to classify igneous rocks? a. only its origin b. only its mineral composition c. its origin, texture, and location d. its origin, texture, and mineral composition

Name the organs of humanelemintary canal.

Draw the structure of dna nucleotide with adenine as nitrogenous base

1. beginning with all chambers of the heart in the "relaxed" phase, describe the cardiac cycle in mammals, with systole and diastole of the atria and ventricles. for each time point in the cycle you select, state the following: • whether the atria and ventricles are contracting or relaxing • whether the av valves and semilunar valves are closed or open • whether the pressure in the atria and ventricles is high or low